Nonskid roof jack



mwimz @ec. 25 W23 M.; H. STANSBERRY NONSKID ROOF JACK Filed Dec. 2''! 1921 G a f Y W a M Patented Dec. 25, 11923.

UNHTED- MAURICE H. STANSBEBRY, OF KANSAS CITY, MISSOURI.

NONSKID ROOF JACK.

Application filed December 27, 1921. Serial No. 524,916.

To all whom it may concern Be it known that I, MAURIoE H, STANS- BERRY, a citizen of the United States, and resident of Kansas City, county of Jackson, State of Missouri, have invented a certain new and useful Improvement in Nonskid Roof Jacks, of which the following is a complete specification.

This invention relates to roof jacks adapted for use by painters, carpenters, roofers, or any one engaged in working on or repairing shingled or other roofs of similar character.

One of the objects of the invention is to produce a device of this character provided with spurs adapted to be slightly embedded in the roof at a plurality of points without injury to or marking the roof, not only to lessen the liability of slippage by the device, but also to prevent injury to the roof.

Another object is to produce a device of this character which is constructed in joined relation to strengthen the structure and protect it from damage due to careless or rough usage.

A further object is to produce a roof jack in which the operator is provided with three points of support, as will hereinafter appear, for convenience in carrying out the operations of his work without the necessity of continually shifting the position of the jack.

A still further object is to provide a device of the character set forth of simple, strong, durable, efiicient and inexpensive construction; and in order that it may be fully understood, reference is to be had to the accompanying drawing, in which:

Figure 1 is a perspective view of the net.-

i igure 2 1s a central vertical section through the jack as applied in operative position to a roof.

Figure 3 is an enlarged section taken through one of the corner members.

In the said drawing, where like reference characters identify corresponding parts in all of the figures, R illustrates a shingled roof of any of the common and well known types of construction. The jack of the invention consists of a pair of longitudinal members 1, preferably somewhat resilient in character, and the extremities of said member are received between two pairs of transverse members 2. A rectangular framework is thus formed, and it will be understood that the length and width of the framework, as well as the cross sectional area of the material employed may vary to suit the circumstances under which the jack is to be used, as it must be of heavier con struction if repair work or the like is belng done on a chimney, where heavy materials, such as brick and mortar are employed.

Each of the corners of the rectangular framework thus formed are adapted to be held rigidly in position by means of a clamping device 3 of rectangular shape and adapted to engage and enclose the ends of members 1 and 2, and be held in position by a bolt 4 engaging the longitudinal member 1, as clearly shown in Figure 3.

In order to retain the members 2 within the clamping devices 3 a series of bolts 5 are provided, said bolts being formed with rounded heads to guard against catching the clothes or interfering with the operator, and are also formed with squared portions 6 near their upper ends for engagement with squared openings in the devices 3 and members 2 to hold the bolt against rotation. The bolts 5 are threaded as at 7 near their lower ends and the extremities of said bolt are formed with spurs 8, said spurs being slightly curved and when in assembled position, so adjusted that the points are in line with the longitudinal members and toward the lower pair of transverse members, as will be clearly apparent by reference to the drawing. In engagement with the threaded portion 7 of the bolts are nuts 9 for clamping the corner devices firmly in position to hold the members of the frame against movement in any direction.

Preferably at any point central of the length of the longitudinal members are a pair of block members 10 one secured to each longitudinal frame members, and said pair of blocks support a platform 11, adapted to be used as a seat by the worker or to support material or tools. In this connection it is desirable to point out that the blocks and platform will preferably be held in position by screws 12, as being a stronger and safer construction than nails.

In operation the spur members are so turned, as above set forth, that when the jack? is placed on a roof and the operator imposes his weight thereon, the spurs will be slightly embedded in the roof and will reliably maintain the position of the jack without injury or marking the roof in any manner. As the spurs are curved downwardly, when it is desired tomove the position of the jack, it is only necessaryfor the, operator to grasp the jack platform and pull slightly upwardly, which motion will withdraw the spurs from their embedded positions, as will be readily understood.

From the above description it will be apparent that I have produced a device of the character described, which possesses all of the features of advantage set forth as desirable, and while I have described and claimed the'preferred embodiment of the longitudinal supports, a series of downwardly projectingspurs adjacent the'corners of said 'ack, and a platform secured to said longitudinal supports and imposing its entire weightthereon at a point substantially equi-distant from said transverse supports.

2. In a roof jack, the combination of a pair of longitudinal resilient members, two pairs of transverse members at opposite ends of said first-named members and at I opposite sides thereof, a clamping device se-- cured tothe ends of each longitudinal member and enclosing the ends of said trans-e verse members, and a series of bolts pass- 111g through said clamping "devices and,

MAURICE H. srANsBERn f -members and each provided at one end 

